chore: copy issue templates from plantuml repository

.github/ISSUE_TEMPLATE/documentation_request.md

@@ -0,0 +1,27 @@
+---
+name: Documentation request
+about: Identify an area for improvement in documentation
+
+---
+
+**What is the URL of the documentation?**
+
+- **Example:** https://github.com/evantill/docker-cheerpj/blob/main/README.md#example-of-using-cheerpj-on-your-computer
+
+    - *Note:*  This URL includes the web page and the section of the documentation.
+
+**What can be improved?**
+
+A clear and concise description of what can be improved.
+Examples:
+
+- "I don't understand where the ${XYZ} variable is set."
+- "There seems to be a step missing between 'X' and 'Z'.   I don't know how to get to 'Z'."
+- "When I run `command sub-command ...`  I get the following error:"
+- "I don't know what is meant by 'gerble barb gazoink` in the instructions".
+
+**Additional context**
+
+Add any other context or screenshots to help describe the documentation improvement.
+If you think the documentation improvement is operating system specific,
+please indicate which operating system is being used.